US20160053980A1 - Portable cordless illustration tablet - Google Patents

Portable cordless illustration tablet Download PDF

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Publication number
US20160053980A1
US20160053980A1 US14/121,336 US201414121336A US2016053980A1 US 20160053980 A1 US20160053980 A1 US 20160053980A1 US 201414121336 A US201414121336 A US 201414121336A US 2016053980 A1 US2016053980 A1 US 2016053980A1
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US
United States
Prior art keywords
tablet
illustration
dimmer
switch
portable cordless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/121,336
Inventor
Alexander Milton Uphoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US14/121,336 priority Critical patent/US20160053980A1/en
Publication of US20160053980A1 publication Critical patent/US20160053980A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0414—Arrangement of electric circuit elements in or on lighting devices the elements being switches specially adapted to be used with portable lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L4/00—Electric lighting devices with self-contained electric batteries or cells
    • F21L4/02—Electric lighting devices with self-contained electric batteries or cells characterised by the provision of two or more light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L4/00—Electric lighting devices with self-contained electric batteries or cells
    • F21L4/08—Electric lighting devices with self-contained electric batteries or cells characterised by means for in situ recharging of the batteries or cells
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • F21Y2101/02—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention is a cordless portable desk top illustration tablet for making timely convenient tracings of technical illustrations and graphical data.
  • the invention provides a portable cordless means for viewing and inspecting photographs and physical data in the field under conditions of enhanced lighting where close scrutiny or immediate determination is required.
  • the convenience of a portable cordless illustration tablet to make accurate copies of drawings and tracings of items of evidential significance at or near their point of occurrence is important, particularly where a myriad of incidents have simultaneously occurred.
  • These types of observations are more accurately assembled near the time of occurrence when documented by tracing in place. Such assessments become less sensitive to time delay and memory distortion when compiled at a later time.
  • the portable cordless illustration tablet hereafter referred to as the Lightboard is a low profile unit which backlights a workspace for tracing application in technical and artistic fields.
  • LEDs Light emitting diodes
  • the central element of the Lightboard is the LED array shown FIG. 4 .
  • the LED should be a staggered “diamond” pattern with diodes spaced apart by no more than shown in FIG. 5 .
  • LEDs shown in FIGS. 4 and 5 are set in series of three for 9.6V input, but may be altered to suit other input voltages. The current-limiting resisters would need to be changed for any new input voltage.
  • the LED panel is mounted to the bottom of a shallow housing, shown in FIGS. 1 through 3 .
  • This housing provides a standoff distance of 13.7 mm between the LED panel and an acrylic or glass work surface.
  • the inside surface of the work surface is made to diffuse light by etching, abrasion, or the application of a translucent film.
  • Also contained in the housing is a rechargeable battery pack. The low power consumption the LED panel allows the unit to be self-contained, permitting true portability.
  • FIG. 1 shows the plan view of the housing with labeled cavities: the LED array compartment, controls space, and the battery compartment.
  • FIG. 2 is the bottom view relative to plan view, showing clip slots.
  • FIG. 3 is a section view of standoff distance between LEDs and work surface.
  • FIG. 4 is plan view showing the LED array, which includes current-limiting resisters.
  • FIG. 5 is the detail of the LED array illustrating optimal spacing between LEDs for uniform lighting.
  • FIG. 6 is a schematic of the wiring of the LEDs with a single switch control.
  • FIG. 7 is a schematic of wiring with dual switch control, on/off and high/low settings with dimmer switch operating at set value.
  • FIG. 8 is a schematic of wiring with dual switch control, on/off and high/low settings with dimmer switch potentiometer driven.
  • the Portable Cordless Illustration Table or Lightboard consists of an LED panel, battery, power/dimmer circuit, housing, and cover.
  • FIGS. 1 and 2 show a cover, or work window 1 , which diffuses light and is smooth on at least one side, which faces outward.
  • Acrylic material is preferable for a portable unit since it is more durable than glass. It can be made to diffuse light one of several ways, the inner face can be etched or abraded, or a light diffusing film, such as a simple window privacy film, can be applied.
  • FIGS. 1 through 3 display the housing 2 , which is one piece of molded plastic to which all of the other components are mounted. It provides standoff 3 , a distance of 13.7 millimeters, between LEDs 4 and work surface 1 shown in FIG. 3 .
  • the housing 2 has three cavities, as shown in FIG. 1 ; one is the battery compartment 5 , a second is for the control hardware 6 , and a third, main cavity is the LED 4 array compartment 7 .
  • slots 8 shown in the sides of the housing to facilitate the use of binder or other clips to affix the users' work to the unit repeatedly and without harm to delicate paper products.
  • FIG. 4 shows how the LED 4 panel allows for the broad distribution of light source, making uniform lighting achievable in a much shorter distance than conventional light tables.
  • Current limiting resistors 9 are also shown.
  • FIG. 5 shows the staggered diode pattern which yields excellent initial light distribution.
  • the vertical edge spacing 18 is 12.3 millimeters and the horizontal edge spacing 19 is 12.4 millimeters.
  • Vertical spacing 20 between LEDs 4 is 15.9 millimeters.
  • Horizontal spacing 21 between columns is 15.6 millimeters.
  • FIG. 6 is an electrical schematic of LEDs 4 operated by a single switch 13 between states “on” and “charge”. In “charge” state, LEDs 4 are off, and batteries are recharged by charger 12 .
  • FIG. 7 and FIG. 8 include dimmer 16 .
  • the dimmer 16 should be a high frequency pulse bandwidth modulator (PBM). This type of dimmer will extend battery life by allowing the user to adjust the brightness to suit ambient light conditions.
  • PBM pulse bandwidth modulator
  • FIG. 7 is an electrical schematic of LEDs 4 operated by two switches.
  • Switch 13 changes between “on” and “charge” states, as above.
  • Switch 14 changes between “high” and “low” states.
  • FIG. 8 is an electrical schematic of LEDs 4 operated by switch 13 and potentiometer 15 .
  • Switch 13 changes between “on” and “charge” states, as above.
  • the dimmer 16 incorporates potentiometer 15 allowing more precise brightness adjustment.

Abstract

The Portable Cordless Illustration Tablet outlines the design and construction of a low power LED array and required housing and controls to make a low profile, battery powered, portable light table.

Description

    CROSS REFERENCES Background of the Invention
  • The invention is a cordless portable desk top illustration tablet for making timely convenient tracings of technical illustrations and graphical data. The invention provides a portable cordless means for viewing and inspecting photographs and physical data in the field under conditions of enhanced lighting where close scrutiny or immediate determination is required. Under these circumstances the convenience of a portable cordless illustration tablet to make accurate copies of drawings and tracings of items of evidential significance at or near their point of occurrence is important, particularly where a myriad of incidents have simultaneously occurred. These types of observations are more accurately assembled near the time of occurrence when documented by tracing in place. Such assessments become less sensitive to time delay and memory distortion when compiled at a later time.
    • Summary of the Invention
  • The portable cordless illustration tablet hereafter referred to as the Lightboard is a low profile unit which backlights a workspace for tracing application in technical and artistic fields.
  • Light emitting diodes (LEDs) allow the light source to be broadly distributed so the distance required to achieve even light distribution can be very short, which allows the unit to be compact, and their low power consumption allows for the easy use of battery power to enhance a portable graphical capability in the field.
  • The central element of the Lightboard is the LED array shown FIG. 4. For uniform lighting, the LED should be a staggered “diamond” pattern with diodes spaced apart by no more than shown in FIG. 5. LEDs shown in FIGS. 4 and 5 are set in series of three for 9.6V input, but may be altered to suit other input voltages. The current-limiting resisters would need to be changed for any new input voltage.
  • The LED panel is mounted to the bottom of a shallow housing, shown in FIGS. 1 through 3. This housing provides a standoff distance of 13.7 mm between the LED panel and an acrylic or glass work surface. The inside surface of the work surface is made to diffuse light by etching, abrasion, or the application of a translucent film. Also contained in the housing is a rechargeable battery pack. The low power consumption the LED panel allows the unit to be self-contained, permitting true portability.
    • DRAWINGS
  • 7 drawings are presented to illustrate how the completed Portable Cordless Illustration Tablet (Lightboard) works.
  • FIG. 1 shows the plan view of the housing with labeled cavities: the LED array compartment, controls space, and the battery compartment.
  • FIG. 2 is the bottom view relative to plan view, showing clip slots.
  • FIG. 3 is a section view of standoff distance between LEDs and work surface.
  • FIG. 4 is plan view showing the LED array, which includes current-limiting resisters.
  • FIG. 5 is the detail of the LED array illustrating optimal spacing between LEDs for uniform lighting.
  • FIG. 6 is a schematic of the wiring of the LEDs with a single switch control.
  • FIG. 7 is a schematic of wiring with dual switch control, on/off and high/low settings with dimmer switch operating at set value.
  • FIG. 8 is a schematic of wiring with dual switch control, on/off and high/low settings with dimmer switch potentiometer driven.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • The Portable Cordless Illustration Table or Lightboard consists of an LED panel, battery, power/dimmer circuit, housing, and cover.
  • FIGS. 1 and 2 show a cover, or work window 1, which diffuses light and is smooth on at least one side, which faces outward. Acrylic material is preferable for a portable unit since it is more durable than glass. It can be made to diffuse light one of several ways, the inner face can be etched or abraded, or a light diffusing film, such as a simple window privacy film, can be applied.
  • FIGS. 1 through 3 display the housing 2, which is one piece of molded plastic to which all of the other components are mounted. It provides standoff 3, a distance of 13.7 millimeters, between LEDs 4 and work surface 1 shown in FIG. 3. The housing 2 has three cavities, as shown in FIG. 1; one is the battery compartment 5, a second is for the control hardware 6, and a third, main cavity is the LED 4 array compartment 7. In FIG. 2 are slots 8 shown in the sides of the housing to facilitate the use of binder or other clips to affix the users' work to the unit repeatedly and without harm to delicate paper products.
  • FIG. 4 shows how the LED 4 panel allows for the broad distribution of light source, making uniform lighting achievable in a much shorter distance than conventional light tables. Current limiting resistors 9 are also shown.
  • FIG. 5 shows the staggered diode pattern which yields excellent initial light distribution. The vertical edge spacing 18 is 12.3 millimeters and the horizontal edge spacing 19 is 12.4 millimeters. Vertical spacing 20 between LEDs 4 is 15.9 millimeters. Horizontal spacing 21 between columns is 15.6 millimeters.
  • 9.6 volts was selected as the input for two reasons: LEDs commonly operate in the 3v range, so it is very easy to source LEDs to set in series of three to accept this voltage input. Also, standard, high-capacity rechargeable batteries are commonly 1.2v, so it is also very easy to source a stack of 8 batteries to meet voltage and capacity requirements for the unit.
  • FIG. 6 is an electrical schematic of LEDs 4 operated by a single switch 13 between states “on” and “charge”. In “charge” state, LEDs 4 are off, and batteries are recharged by charger 12.
  • FIG. 7 and FIG. 8 include dimmer 16. The dimmer 16 should be a high frequency pulse bandwidth modulator (PBM). This type of dimmer will extend battery life by allowing the user to adjust the brightness to suit ambient light conditions.
  • FIG. 7 is an electrical schematic of LEDs 4 operated by two switches. Switch 13 changes between “on” and “charge” states, as above. Switch 14 changes between “high” and “low” states.
  • FIG. 8 is an electrical schematic of LEDs 4 operated by switch 13 and potentiometer 15. Switch 13 changes between “on” and “charge” states, as above. The dimmer 16 incorporates potentiometer 15 allowing more precise brightness adjustment.
    • DRAWING ELEMENTS
    • 1. Work window (cover)
    • 2. Housing
    • 3. Standoff
    • 4. LED lights
    • 5. Battery compartment
    • 6. Space for controls
    • 7. LED array compartment
    • 8. Clip slots (bottom view)
    • 9. Current limiting resisters
    • 10. “A” showing the detail section of FIG. 4
    • 11. Copper
    • 12. Charger
    • 13. Switch for “on” and “charge” states
    • 14. Switch for “high” and “low” states with a fixed brightness dimmer
    • 15. Potentiometer for adjusting dimmer
    • 16. Dimmer
    • 17. Batteries
    • 18. Vertical edge spacing, 12.3 mm
    • 19. Horizontal edge spacing, 12.4 mm
    • 20. Vertical spacing, 15.9 mm
    • 21. Horizontal spacing, 15.6 mm

Claims (3)

What is claimed is:
1. A Portable Cordless Illustration Tablet consisting of LED lighting array which allows for the distribution the light, an acrylic cover, molded plastic housing, rechargeable batteries, and controlled by a switch which toggles between On and Off/charge positions.
2. The tablet controlled by the switch above and a dimmer of set io value.
3. The tablet controlled by the switch above and a dimmer using a potentiometer allowing more precise brightness adjustments.
US14/121,336 2014-08-21 2014-08-21 Portable cordless illustration tablet Abandoned US20160053980A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/121,336 US20160053980A1 (en) 2014-08-21 2014-08-21 Portable cordless illustration tablet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/121,336 US20160053980A1 (en) 2014-08-21 2014-08-21 Portable cordless illustration tablet

Publications (1)

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US20160053980A1 true US20160053980A1 (en) 2016-02-25

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US14/121,336 Abandoned US20160053980A1 (en) 2014-08-21 2014-08-21 Portable cordless illustration tablet

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD838397S1 (en) * 2015-04-03 2019-01-15 Cambridge Sound Management, Inc. Indicator light panel for a sound masking system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329625A (en) * 1992-04-15 1994-07-12 International Business Machines Corp. System to service processor interface for a tablet computer
US20090267891A1 (en) * 2008-04-25 2009-10-29 Bamidele Ali Virtual paper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329625A (en) * 1992-04-15 1994-07-12 International Business Machines Corp. System to service processor interface for a tablet computer
US20090267891A1 (en) * 2008-04-25 2009-10-29 Bamidele Ali Virtual paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD838397S1 (en) * 2015-04-03 2019-01-15 Cambridge Sound Management, Inc. Indicator light panel for a sound masking system

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